I can't give you as much guidance this year as you don't have a Czech team, but I used to live in Austria so am familiar with going to Salzburg. The Munich + Train option is a really good shout, and actually that's easier than going to Vienna or somewhere & taking the train from there.
Salzburg is BEAUTIFUL. It's not very big so everything is pretty much walkable, but it's almost exactly what you imagine Austria to be like. The rink is on a bus line or you can walk from the "centre" in about 25-30 minutes. When they've had big away crowds in CHL they've given them the whole of the upstairs behind one goal (Bystrica last year had 400+ fans, Steelers before had several hundred) so I expect something similar will happen. The away block is normally 40% or so of the seats up there. We did a 'Feature game' there last year and booked an AirBnB which was really nice.
Going to Bern/Zurich by train from Salzburg is absolutely the best idea I can give you. Just don't bother flying. I know at home we have a poor opinion of trains, but these OBB Railjet ones are really nice and have an on-board restaurant where you can sit down for a cooked meal. Regular tickets are in a 2/2 (so four seats separated by an aisle) configuration with some tables, and the first class are a 2/1 set-up with leather chairs. If you take first, they'll serve you orders from the restaurant at your seat and you have a bit more space. In economy you can either go to the restaurant car, or a trolley does come through with refreshments & sandwiches. Six hours seems like a lot but if you factor in that with a plane you have to travel 30 minutes to the airport, be there 2hrs before, do the flight (an hour) which may involve a connection (then 2-3hrs), and then another 30 minutes getting out of the airport etc. it's almost the same! It's a very comfortable ride, there's usually WiFi, and the scenery is lovely. Plus you go from city centre to city centre.
Switzerland is expensive, I'm sure you remember from Davos. Bern have a massive rink so you won't need to worry about tickets. Also there's no EU Roaming with your phones there so data costs.
Vaxjo... Copenhagen & Train is by far the simplest way to do it apart from direct, unless you can get a cheap flight to Malmo or something - but even then you need to get into the city which is a pain.